switch(p){

              case CHINESE:

                     System.out.println(\"p is Chinese\");

                     break;

              case AMERICAN:

                     System.out.println(\"p is American\");

                     break;

              case ENGLISH:

                     System.out.println(\"p is English\");

                     break;

              }

              //获得枚举值在枚举类型中声明的顺序